Physically similar to both Eberron and Lamannia, Thelanis is a realm of rugged natural beauty—primarily lush forests and crystal-clear waters. Among the trees rise shadowy spires of enchanting beauty, surrounded by mesmerizing lights that look like dancing lanterns. Phosphorescence gleams on plants and stones, lighting the eternal twilight of the plane, while a multitude of stars twinkle in the sky.

Thelanis has the following traits:
• Enhanced magic: Arcane spells are empowered and extended.
• Flowing time: For every day spent on Thelanis, a week passes on the Material Plane. Time lost on Thelanis catches up with the traveler; nonnatives who spend time on Thelanis and then return to their home plane may be ravenous if they have not eaten in weeks as measured by Material Plane time, and they may actually grow old or die if they have been a long time on Thelanis. Natives of Thelanis are unaffected by this phenomenon.Thelanis Inhabitants:Dryad, eladrin (all), lillend, nymph, satyr, sprite (all), triton, Sylph, Petal, shimmerling swarm, thorn.

Coterminous: When Thelanis is coterminous to the Material Plane, certain magical areas manifest on Eberron, primarily in wilderness areas but also in groves nearer to civilization. Faerie rings (circles of toadstools) and faerie mounds (small bulges in the earth) can be found at such times, often accompanied by mysterious lights. These features are points where the boundary between the planes is thin and passage in either direction can occur easily. Travelers are wise to avoid mysterious lights, for the natives of Thelanis have been known to lure mortals to their native realm—often with no hostile intent, but heedless of the effect that spending time in the Faerie Court can have on the natives of Eberron.
Arcane spells are extended if cast within 300 feet of a faerie ring or faerie mound. Fey creatures are more populous on Eberron during Thelanis’s coterminous periods. Thelanis is coterminous for a period of seven years every 225 years. When its coterminous phase ends, the plane travels in its orbit for 102 years before becoming remote.Remote: When Thelanis is remote, fey creatures grow less populous and their power fades. The caster level for any fey’s innate spell-like and supernatural abilities is reduced by 1.
Thelanis is remote for a period of fourteen years every 225 years. When its remote phase ends, the plane travels in its orbit for 102 years before becoming coterminous.